507
Q:

# A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?

 A) 54 % B) 64 % C) 74 % D) 84 %

Explanation:

Let the number be x.

Then, ideally he should have multiplied by  x by 5/3. Hence Correct result was x * (5/3)= 5x/3.

By mistake he multiplied x by 3/5 . Hence the result with error  = 3x/5

Then, error = (5x/3 - 3x/5) = 16x/15

Error %  = (error/True vaue) * 100 = [(16/15) * x/(5/3) * x] * 100 = 64 %

Q:

If U = 450 and V = 585, then V is how much percentage more than U?

 A) 130 B) 23.07 C) 25 D) 30

Explanation:

3 101
Q:

What will be the net discount (in percentage) for two successive discounts of 30% and 20%?

 A) 50 B) 56 C) 44 D) 54

Explanation:

2 102
Q:

If 170% of a number added to 66, then the result becomes equal to twice of the number. What is the number?

 A) 200 B) 220 C) 210 D) 236

Explanation:

1 95
Q:

60% of P = 50% of Q and Q = x% of P. What is the value of x?

 A) 130 B) 120 C) 140 D) 80

Explanation:

2 124
Q:

The marked price of a shirt is twice of the cost price. To earn a gain of 25%, what should be the discount percentage?

 A) 37.5 B) 50 C) 75 D) 52.5

Explanation:

4 235
Q:

If 30% of 40% of X is 240, then what is the value of X?

 A) 441 B) 2000 C) 1200 D) 1800

Explanation:

2 135
Q:

A man sells an article at a profit of 35%. If he had bought it for 15% less price and sold it for Rs. 32 less, then he would have gained 40%. What is the initial cost price (in Rs) of the article?

 A) 250 B) 200 C) 300 D) 400

Explanation:

0 238
Q:

If the side of square is increased by 6%, then what will be the percentage increase in its area?

 A) 3.2 B) 12.04 C) 12.12 D) 12.36